It is its perimeter
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If the shape is two-dimensional then it is a circle, if the shape is three-dimensional then it's a sphere.
The perimeter.
the difference between a two dimensional shape and and a solid is that a two dimensional shape is plane and a solid you can see the whole shape a the inside.
The Perimeter
An oval is two-dimensional. An ovoid is a three-dimensional shape based on an oval - like an egg,